Electron enrichment in 3d transition metal oxide hetero-nanostructures

Coleman X. Kronawitter, Jonathan R. Bakke, Damon A. Wheeler, Wei Cheng Wang, Chinglin Chang, Bonnie R. Antoun, Jin Z. Zhang, Jinghua Guo, Stacey F. Bent, Samuel S. Mao, Lionel Vayssieres

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

Direct experimental observation of spontaneous electron enrichment of metal d orbitals in a new transition metal oxide heterostructure with nanoscale dimensionality is reported. Aqueous chemical synthesis and vapor phase deposition are combined to fabricate oriented arrays of high-interfacial-area hetero-nanostructures comprised of titanium oxide and iron oxide nanomaterials. Synchrotron-based soft X-ray spectroscopy techniques with high spectral resolution are utilized to directly probe the titanium and oxygen orbital character of the interfacial region's occupied and unoccupied densities of states. These data demonstrate the interface to possess electrons in Ti 3d bands and an emergent degree of orbital hybridization that is absent in parent oxide reference crystals. The carrier dynamics of the hetero-nanostructures are studied by ultrafast transient absorption spectroscopy, which reveals the presence of a dense manifold of states, the relaxations from which exhibit multiple exponential decays whose magnitudes depend on their energetic positions within the electronic structure.

Original languageBritish English
Pages (from-to)3855-3861
Number of pages7
JournalNano Letters
Volume11
Issue number9
DOIs
StatePublished - 14 Sep 2011

Keywords

  • Carrier dynamics
  • electronic structure
  • interfacial charge transfer
  • nanostructure
  • oxide heterostructure

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